Brake-shoe.



CIW. ARMBRUST.A BRAKE SHOE.

APPLICATION FILED MAlvJ, 1911.

Patented No. 28, 1911.

f :op-ending aprilie l UEF STAIES.

PATENT GFICE.

C RLES Vv". ARMBRUST, 0F CRYSTAL LAKE, ILLINOIS, ASSIGNOR 0F NE-FOURTI TO SYDNEY STEIN, F CHICAGO, ILLINOIS.

BRAKE-SHOE.

Specicaton of Letters I'a'cent.

'Patented Nov. es, 19.1.1.

Original appceton filed January 18, 1911, Serial Eo. 603,268. Divided and this application led March 8,

To et?! who-m if may concern.:

Serial No. 613,610.

the accompanying drawings illustrating one Be itlrnown that I. CHARLES W'. Anse preferred embodiment thereof.

s; rsr, a citizen of the United States, resid- 'f at Cry Verfain new and useful Brake-Shoes, of "which the following is a i {ieati n.

in' more particule :I known as entierros es e .9S airy worn shoe ma? wearing face of an@ shoe thereby enabling the worn to oe used up, and nresent applica Mision of my Serial Fo. 603,268, led Jann -rf i. 3.. Il.

' objects of the present invention is the pro `ision of an interlocking shoe wherein the interlocking parts on the b aol; and face of similar shoes are constructed to be engaged in int eckii relation by movone of the shoes transversely relatively tothe other, the shoes being,r so shaped that when interlockingly engaged. the portions therei intermediate the ends are spaced r mother chief-1 of this invention is the of shoe having end guide lugs hrust lees adapted to coperste wish oi e, brake heed to maintain enf: but net having he or 'sstening lng by t end J centrati means or which he. s .Je attached to the. brake head. By providing upon the center s` ce of maximum transverse strength.

@ther ohiects and advantages'of 'the present invention will be apparent as 1t 1s better understood by reference to the followin description when taken in connection Wit al Lahe, in the County of Mca y and :itste et lliinois, have infented;

improvements in shoe or' predetermined thickness, pro-v fleferring to the drawings-Figure 1 is a Lide elevation of an interlocking shoe embodying my invention. Fig. 2 is o top plan View thereof. Fig. 3 is a face View; F 4f 60 is r. sectional vView on the line Q-of Fig.

' 1, and Fig. 5 is a fragmentary IieW of a modified form of shoe.

Gn the drawings 5 designates the main body member of av shoe provided on its back with an integral centrally disposed looking stud or lug 6, the sides of which are undercut, indicated, at 7.", for interlocking eng gement with a detachable holding or fastening lug 8, sho-Wn in dotted lines in Fig. lr The thrust; lugs 9 formed integrally `with the shoe body are -arranged transversely of the back of the shoe preferably at the ends thereof, and adjacent the thrust lugs are formed the guide lugs l0 dis- 75 posed upon the longitudinal axis of the shoe. The guide lugs are of ropenwidth to dt snugly between the end prongs of a brake head and coperate therewith to maintain the shoe in alineinent, while the thrust lugs are positioned to engage the outer ends of the brake head end prongs. Upon the back of 'the shoe and intermediate 'the central locking lug and the end guide and thrust lugs, are arranged the locking lugs 11 which extend transversely of the sho-e body and have their longtudinal sides undercut similarly to the ventral locking lug or stud.

T're face of the shoe is provided with a een i locking recess 12 having undercut l90 vrsls for locking engagement with the central locking lug or stud 6 of a similarly shaped shoe, and undercut recesses 13 for locking engagement with similarly sha-pcd locking lugs l1. The ends of the shoe-.are provided with depressions adapted the reception of the thrust lugs 9 and with shallower depressions 15 for th= nimm dation of the guide lugs 10. It y be o`o served that the locking lugs 6 and 11 and the thrust lugs 9 do not extend entirely across the back of the shoe but terrn are at each end short of the sides o the shes body. .It will be' observed also that the locking recesses 12 and 13 and the ieessions M are open at one end to receive 'the locking lugs and thrust lugs and are closed at their other ends to preventI lateral of' the worn shoe beyond that side of the fixed sli-Je. The shoes are fastened to the the recesses i ying adjacent the flange of the wheel which is relied upon to prevent lateral displacement of the worn shoe inwardly. The depressions 15 are shown as extending only partially across the face of the shoe and a suiieient distance to reive the axially disposed guide lugs l0.

It will be evident from an inspection of Fig. l that the backs and faces of the shoes are formed on the arcs' of concentric circles of diticrent radii, the back of the shoe being formed on the arc of a circle having a greater radius than the circle upon which the face of the shoe is formed. Tl conf struction permits the back and face of interlocked lshoes to be spaced apart so that the locking recesses 12 and 13 may bemade Shallouer than would be possible ii the back and face oi the interlocked-shoes lay flush against each other throughout their length. Tln` locking recesses are accord ingly made of less depth than the locking lugs 6 and ll, thus enabling the lifs to serve. as spacing lugs to space the ba and face of the shoes apart as Well as locking lugs to lock the shoes together. The depressions 14 and l5 are also slightly sha1 lower than 'the thrust and guide rugs 9 and l0 so that these lugs serve to space the ends of the shoes apart: when they are interlockingly engaged. By making the rece es on the. face of the shoes as shallow as con sistcnt with the locking of the 'shoes together the maximum nount of material may be invf'orporated in a shoe of a prede` termined thickness; and furthermore the spacing of the shoes permits the entire body of the acting shoe to be Worn away `before any portion of the back shoe is brought into contact with the Wheel.

in the modification disclosed in Fig. 5 the inner end of the guide lug 10 and the outer side of the thrust lug 9 are under cut. The depression 14 shown in the previous modification has an outer Wall 1G under cnt to engage the under cut lug 9 and the inner wall of the recess l5 is also under cut to engage With the under cut lug 10. By this construction the guide and thrust lugs are adapted to serve also as spacing lugs.

From the foregoing it is thought that the construction. operation and many advantages of the herein described invention will he apparent to those skilled in the art without further description. and it 'ill be onder- Vstood that various changes in the size. shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

I Iclaim: l. An interlocking brake shoe comprising Vbrake head with the closed ends of the rea body member provided on its back ivith cesses disposed outwardly, the open ends of end guide and thrust lugs, and centrally disposed means hmnogeneous with the hotly ot the. shoeto permit attachment thereto and detachment therefrom of a brake shoe fastoning or holding hief.

2. An interlocking bra-ke shoe comprising a body member provided on its back with end guide and thrust lugs, and centrally dis postd means adapted for successive attachment thereto and detachment. therefrom. of an integral fastening or holding 'lug and haring on its face depressions adapted to receive the guide and thrust lugs and centrally disposed means of a similarly shaped shoe.

3. An interlocking brake shoe comprising a body member provided on its back wifh end guide and thrust lugs. locking lugs, ard centrally disposed means for the attachment. of a fastening or holding lug.

4. An interlocking brake shoe comprising4 a body member provided on its back with guide lugs. thrust lugs, locking lugs ant? centrally disposed means for the attachment of a fastening or holding lug. and having on its face. recesses for interlocking engagement 'n ith the locking lugs and centrally disposed means of a similarly shaped shoe.

An interlocking brake shoe con'iprising a body member provided on its back with a centrally disposed stud adapted to he engaged b v-an attaching lug detachable lfrom said stud, and guide and thrust lugs disposed adjacent the ends of the body member, the face of said member being provided with recesses to accommodate said stud, guide. lugs' and thrust lugs.

G. A n interlocking brake shoe comprising a body member having the back and face thereof formed on the arcs of different circles, the back' of the shoe being provided with lugs and the face of the shoe being provided with recesses to receive the lugs of a similarly shaped shoe, said reeesse being shallower than the lugs engaged therein, whereby the face and back of the interlocking shoes are spaced apart throughout their length.

7. An interlocking bral-:e shoe comprising a body member haring lugs on its back and recesses oi. its face to'interlock with the lugs of a similar shoe, the curvature of the face of the shoe being greater than the curvature of thtl hack thereof. said recesses being shallower than the lugs engaged thermvith. whereby the hack and face. of intcrlocked shoes' are spaced apart throughout their length.

8. An interlocking brake shoe comprising a body member pro -ided with depressions on its face and haring means on itsV back to engage with the depressions in a Similarly shaped shoe whereby theV shoes are locked together and spaced apart tnroughout their entire lengjfhE 9. An interlocking brake shoe, com rising a bodyv member provided on its ack -with end guide and thrust lugs and on its face with recesses to receive the guide and thrust lugs of a similarly shaped shoe, said guide and thrust lugs and the Walls of said recesses being undercut to form an interlocking engagement between the shoes.

lO. An interlocking brake shoe, comprising a body member provided on its back CHARLES W. ARMBRUST.

Witnesses:

IRA J. WILSON, M. ROBERTSON.

Copies of this patent may he obtained for five cents each, by addressing the "Commissioner of Patents,

Y Washington, D. 03" 

